Electromagnetically-operated device



Aug. 28, 1928. v 1,682,676 J. HORTON V ELECTROMAGNETICALLY OPERATEDDEVICE Filed June 22, 1918 5 e Z1 20 as Patented Aug. 28, 1928 PATENTOFFICE.

UNITED STATES ALBERT J. HORTON, OF WHITE PLAINS,

NEW YORK, ASSIGNOR TO THE CUTLER- HAMMER MFG. GO., OF MILWAUKEE,WISCONSIN, A CORPORATION OF WISCONSIN.

ELECTEDMAGNETICALLY-OPERATED. DEVICE.

Application filed June 22,

This invention relates to electromagnetically operated devices, and,while not limited thereto, is particularly applicable to motorcontrolling devices.

In practice it is often desired to eifect operation of electromagneticdevices of various kinds by momentary closure of a push button switchand to include a resistance in circuit with the operating winding of thedevice upon completion of its operation and the present invention hasamong its objects to provide in conjunction with such devices simplifiedmeans affording the aforesaid control thereof.

Also the invention has other objects and advantages which willhereinafter appear.

The accompanying drawing illustrates an embodiment of the inventionparticularly designed for motor control and the same will now bedescribed, it being understood that certain features illustrated mightbe advantageously used in various other relations.

In the accompanying drawing, Figure 1 shows the controllerschematically; and,

Figs. 2, 3 and 4. show in detail a preferred construction of a part ofthe controller.

The controller illustrated comprises a rock shaft 1 carrying contactarms 2, 3 and 4 which are shown as co-operating with contacts 5, 6 and 7to control the armature circuit of a compound motor M, an electromagnet8 foractuating said rock shaft and auxiliary contact arms 9 and 10, theformer to control the electromagnet 8 and the latter. to control a shuntaround a field rheostat R for motor M. That part of the controllercomprising the rock shaft 1, contact arms 2, 3 and 4 and electromagnet 8is of a well known form wherein the contact arms are set in differentangular positions on the rock shaft to engage contacts 5, 6 and 7successively and the electromagnet 8 is provided with a normally openpush button switch 11 for energization thereof and with a normallyclosed push button switch 12 for de-energization thereof. Accordin 1y itwill be understood that in order to o tain full operation of thecontroller by momentary operation of the push button switch 11 it isnecessary to parallel said switch, and the contact arm 9 with its'co-1918. Serial No. 241,364.

operating contacts is provided for this purpose and for the furtherpurpose of inserting a resistance r in series with the electromagnet 8after full response thereof. Also, as will be understood, it is desiredto short circuit the field rheostat throughout the period of armaturecontrol and to then interrupt the short-circuit thereof and the contactarm 10 with its associated contact is provided for this purpose.

As shown in Figs. 2, 3 and 4 the contact arms 9 and 10 are bothpivotally supported on an upstanding lug 13 provided on the rock shaftthrough said lug, said arms being arranged on opposite sides of saidlug. The lug 13 has a I laterally projecting pin 15 providing a stop forthe contact arm 9 and said arm is blased to-' wards said stop by a leafspring 16 fixed at its lower end to the rock shaft by a screw 17. Also,the switch arm 10 is similarly biased by a leaf spring 18 fixed at itslower end to the rock shaft by a screw 19 and said arms 9 and 10 arerespectively provided with co-operating stationary contacts 20 and 21fixed to a panel 22. In the normal position of the rock shaft, as shownin Fig. 2, the arm 10 engages contact 21 while the arm 9 is held out ofengagement with contact 20 by the stop pin 15. However, the arrangementis such that when the shaft 1 is rocked to position the lug 13 as shownin dotted lines (Fig. 2), thearm 9 engages the contact 20 and thestructureis such that this operation may be effected by momentaryclosure of the push button switch 11. Also, the structure is such thatin the meantime the switch arm 10 remains in engagement with contact 21.On the other hand, the contact arms 9 and 10 are respectively providedwith stop posts 23 and 24 fixed to the panel 22 and said posts functionas shown in Fig. 3 to effect disengagement of both of said arms fromtheir contacts upon continued movement of the lug 13 toward the panel.More specifically each stop post is arranged directly in the path of itsrespective contact arm and above its pivot on the lug 13 wherebycontinued movement of the lug 13 after engagement of said tion of theirrespective springs and the posts are so proportioned that the contactarms are thus disengaged upon completion of the rocking motion of theshaft 1. v

Again referring to Fig. 1, the functions of contact arms 9 and 10 willbe more specifically described. Closure of push button switch 11completes a circuit from line L by conductor 25 through push buttonswitch 12, thence through the winding of electromagnet 8, by conductor26 to line L and contact arm 9 upon engaging contact 20 completes acircuit from line L by conductor 27 through rock shaft 1 and throughsaid arm to contact 20 and by conductor 28 to switch 12, thusparalleling push button switch 11. Hence inasmuch as the contact arm 9is engaged with contact 20 upon initial movement of the rockshaft itenables release of the push button switch 11 after a momentary periodwithout interfering wit-h continued operation of the controller. On theother hand when the operation of the controller is completed, contactarm 9 is disengaged from contact 20, whereupon the current traversingthe electromagnet 8 is forced to take the path from arm 9 to stop post23 by conductor 29 through resistance 1" to conductor 28, thus includingsaid resistance in series with said electromagnet.

In initial position of the controller the switch arm 10 completes ashort circuit for the field rheostat R which extends from the arm ofsaid rheostat by conductor 30 to contact 21 through arm 10 and. therockshaft 1, by conductor 27 to line L. On the other hand, when theoperation of the controller is completed, the arm 10 is disengaged fromthe contact 21 as above described, thereby interrupting the shortcircuit around the rheostat.

What I claim as new and desire to secure by Letters Patent is:

1. In combination, a electromagnetically operated device, an energizingswitch therefor requiring manual retention in closed position, aresistance for inclusion in circuit with the winding of said device uponoperation thereof to a given degree, and an auxiliary switch having acontact element attached to and movable with said device to firstestablish an energizing circuit therefor inde pendent of saidfirst-mentioned switch and to subsequently include said resistance.

2. In combination, an electromagnetically operated device, an energizingswitch therefor requiring manual retention in closed position, anormally open shunt circuit around said switch, a resistance forinclusion in circuit with the winding of said device upon operationthereof to a given degree, and an auxiliary switch having a contactelement movable by said device to close said shunt circuit and controlsaid resistance sequentially.

3. In combination, an electromagnetically operated device, a controlswitch therefor requiring manual retention thereof in closed position, aresistance to be included in circuit with the operating winding of saiddevice upon full operation thereof, and a normally open switch having acontact element operatively connected to said device, said contactelement having other positions to which it is movable by said device tofirst around said switch, a resistance, and a normally open switchhaving a contact element operatively connected to said device, saidcontact element having a position to whichit is movable upon initialmovement of said device to complete said shunt circuit and an otherposition to which it is movable upon continued movement of said deviceto effect inclusion of said resistance in circuit with the operatingWinding of said device.

5. In combination, an electromagnetically operated device having arocking element, a switch for said device having a contact arm pivotallymounted on said rocking element, a stationarily mounted contact to beengaged by said arm upon a given movement of said element and a stop tobe engaged by said arm upon continued movement of said element to effectdisengagement of said arm from said stationary contact.

6. In combination, an electromagnetically operated device, a switchtherefor comprising a contact arm and a stationarily mounted contact tobe engaged by said arm, said device having a rocking element upon whichsaid arm is pivotally mounted and having a stop toward which said arm isbiased, said stop serving to normally disengage said arm from saidcontact but permitting the former to engage the latter upon movement ofsaid rocking element and a. fixed stop in the path of said arm servingto effect disengagement of said arm from said contact upon continuedmovement of said element.

7. In combination, an electromagnetically operated device having arocking element, and a control switch therefor comprising a plurality ofstationary contacts and a cooperating contact arm, said contact armbeing pivotally supported on said rocking element of said device to beengaged with both cluding a rocking element upon which said contact armis pivotally supported and a part to engage said arm to disengage thelatter from said contacts, said arm being biased against said part andbeing operable by said rocking element to engage said contacts and oneof said contacts forming a stop for said arm to eifect its disengagementfrom another of said contacts upon continued movement of said element.

9. In combination, an electromagnetically operated device and a pair ofswitches therefor each comprising a stationary contact and aco-operating contact arm, said device having a rocking element uponwhich said contact arms are pivotally supported and biased toward theircontacts for normal engagement of one of said arms with its contact,said element having a stop for the other of said arms to normallydisengage the same from its contact, but permitting engagement thereofupon initial movement of said element, and fixed stops for said armsproviding for disengagement thereof from their respective contacts u'poncontinued movement of said element.

10. In combination, an electromagnetically operated device and a pair ofswitches there for each comprising a stationary contact and aco-operating contact arm, said device having a rocking element uponwhich said contact arms are pivotally supported and biased toward theircontacts for normal engagement of one of said arms with its contact,said element having a stop for the other of said arms to normallydisengage the same from its contact, but permitting engagement thereofupon initial movement of said element, and fixed stops for said armsproviding for disengagement thereof from their respective contacts uponcontinued movement of said element one of said fixed stops constitutinga secon contact for its respective contact arm.

11. In an electric switch, in combination, a stationary contact, aco-operating rigid contact element, a pivotally movable suportingelement for said contact element, the atter being yieldable relativelyto the former and being biased into a given relation with respectthereto whereby engagement with said stationary contact is effected upona given movement of said supporting element and a stop engageable bysaid contact element upon continued movement of said supporting elementfor disengagement of said contact element from said contact.

12. In an electric switch, in combination, co-operating contacts, arocking element having an arm pivotally mounted thereon and carryingcertain of said contacts, yielding means biasing said arm into a givenrelation with respect to said element whereby engagement of saidcontacts is effected upon a given movement of said element and a stopengageable with said arm to effect disengagement of said contacts uponcontinued movement of said element.

13. In an electric switch, in combination, co-operating contacts, an armcarrying certain of said contacts, a rocking element upon which said armis pivotally mounted, resilient means biasing said arm into a relationwith sai contacts upon a given rocking movement of said element and astop in the path of said arm and located between saidcontacts and thepivot of said arm whereby upon continued movement of said element saidarm is caused to disengage said contacts against the bias of said means.

14. In an electric switch, in combination, a stationary contact, aco-operating rigid contact arm normally out of engagement therewith, apivotally movable supporting element for said arm, the latter beingmovable with respect to said arm, and a stop coacting with said arm toeffect such relative movement, said stop being arranged to provide forengagement with and dis-engage ment from said stationary contact of saidarm upon movement of said element unidirectionally.

15. In an electric switch, in combination, a plurality ofsets ofco-operating contacts, a movable element carrying arms to supportcertain of the contacts of each of said sets, each of said armssupporting its respective contact for relative movement between thelatter and said element and fixed means coacting with said arms toefl'ect such relative movements upon operation of said element, saidelement in one position effecting engagement of certain of said contactsand disengagement of other of said contacts while in respect to saldelement for engagement of another position effecting disengagement ofthe former and engagement of the latter and during unidirectionalmovement effecting both engagement and disengagement of one of said setsof contacts.

16, In combination, an electromagnetically operated device, anenergizing switch therefor requiring manual retention in closedposition, a resistance for inclusion in circuit with the winding of saiddevice upon operation thereof to a given degree, an auxiliary switchhaving a single contact element pivotally attached to and movable withsaid device and a plurality of stationary contacts to be engagedthereby, said contact element being adapted to first engage one of saidstationary contacts to establish an energizing circuit for said deviceindependently of said first mentioned switch and to thereafter engageanother of said stationary contacts to effect inclusion of saidresistance.

17. In combination, an electromagnetically operated device, acontrolswitch therefor requiring manual retention thereof in closed position, anormally open shunt circuit around said switch, a resistance, a rockingelement operable by sald device, an auxlhary switch having a slnglecontact element pivotally carried by said rocking element, a stationarycontact to be engaged by said contact element upon a given operation ofsaid rocking element to eflect completion of said shunt circuit, andanother stationary contact to be subsequently engaged by said contactele- ALBERT J. HORTON.

